How Many Men Masturbate? Stats and Health Effects

Most men masturbate. Surveys consistently put the figure somewhere around three-quarters of adult men in a given month, with lifetime rates even higher. A nationally representative British survey found that roughly 77% of men reported masturbating in the past four weeks, and the number has been climbing over the decades rather than holding steady.¹ On the health side, the picture is more interesting than the simple “normal and harmless” reassurance most people have heard, with research pointing to real effects on prostate risk, sleep, hormones, fertility, and sexual function.

How Common Is Male Masturbation, by Age?

The behavior starts early and ramps up quickly during adolescence. In a large US survey of adolescents, about 63% of 14-year-old boys reported having masturbated at least once. By 15 that rose to roughly 73%, by 16 to 78%, and by 17 to 80%.² These numbers only capture self-reports, and underreporting is a well-known issue in sex research, so real rates are almost certainly higher. For comparison, girls’ rates in the same study started lower and climbed more slowly, reaching about 58% by age 17.

In adulthood the gap between men and women widens further. The British national survey found that among adults aged 16 to 44, men’s past-month masturbation prevalence rose from about 73% to nearly 78% between its two survey waves, while women’s went from 37% to 40%.¹ The upward trend over time likely reflects shifting cultural openness more than an actual surge in the behavior itself. Still, even within populations where strong cultural or religious norms discourage masturbation, it remains common. A study of male religious seminary students, all self-reported virgins, found that about 59% reported having masturbated at least once.³

The bottom line on prevalence: by almost every measure, masturbation is a majority behavior among men across age groups, cultural backgrounds, and relationship statuses. The minority who abstain entirely tend to be younger adolescents who have not yet begun, older adults with declining libido, or individuals whose religious or personal values lead them to avoid it.

Ejaculation Frequency and Prostate Cancer Risk

The most studied health outcome tied to male masturbation is prostate cancer, and the evidence here is genuinely encouraging. A large prospective study followed tens of thousands of men and found that those who ejaculated 21 or more times per month had roughly a 20% lower risk of prostate cancer compared with men who ejaculated four to seven times per month, both when measuring the habit at ages 20 to 29 and again at ages 40 to 49.⁴ An earlier analysis of the same cohort had pointed in the same direction, noting that higher ejaculation frequency did not raise prostate cancer risk and might lower it.⁵

This does not mean masturbation is a guaranteed shield. A narrative review pulling together eleven studies on the topic found mixed results overall. Some data supported the protective association, while others did not, and the studies varied widely in design, population, and how they measured ejaculation frequency.⁶ The strongest data come from the large cohort study mentioned above, and the protective effect was concentrated in low-risk prostate cancers rather than aggressive ones. Whether the mechanism involves flushing potential carcinogens from the prostate, reducing stagnation of prostatic fluid, or something else entirely remains an open question. But the direction of the evidence is clear enough that men wondering whether frequent ejaculation is “bad for the prostate” can relax: if anything, the data lean toward a benefit.

What Happens in the Body During Orgasm

Orgasm triggers a burst of neurochemical activity. One of the most well-documented effects is a sharp rise in prolactin, a hormone released by the pituitary gland. Studies have shown that plasma prolactin levels jump after orgasm and stay elevated for at least an hour, whether orgasm is reached through intercourse or masturbation.⁷ This prolactin surge appears to work as a natural “cooldown” signal. It feeds back into the brain to dampen dopamine-driven arousal, which is part of why sexual desire drops after orgasm and why most men experience a refractory period before they can become aroused again.⁸ Interestingly, the prolactin rise after intercourse tends to be larger than after masturbation, which may partly explain why partnered sex often produces a deeper feeling of satisfaction and sleepiness.

Orgasm also activates the sympathetic nervous system, releasing adrenaline and noradrenaline. An electrocardiographic study of 120 men found changes in heart rhythm after ejaculation, including increased T-wave and QRS amplitudes and a brief blood pressure spike, all consistent with that adrenaline surge.⁹ The cardiovascular demand, however, is modest. Continuous monitoring during sexual activity has shown that the average peak heart rate at orgasm is roughly 115 beats per minute, about 61% of predicted maximum for young men.¹⁰ That puts the intensity in the range of a brisk walk or light jog. For most healthy men, the cardiac stress of masturbation is trivial.

Effects on Sleep

A lot of men report masturbating at bedtime specifically to help them fall asleep, and there is emerging evidence that this actually works. A pilot study tracking cohabiting couples found that both solo masturbation and partnered sex improved sleep efficiency and reduced time spent awake during the night, compared with nights when no sexual activity occurred.¹¹ The catch: participants also went to bed later on nights involving sex or masturbation. The likely mechanism connects back to the prolactin surge and the post-orgasmic shift from sympathetic (fight-or-flight) to parasympathetic (rest-and-digest) nervous system activity. Together, these create a physiological state that favors drowsiness. Subjective ratings of sleep quality, though, did not differ across conditions in that study, so the benefit may be more about sleep architecture than about how rested people feel in the morning.

Stress, Mood, and the Immune System

The relaxation that follows orgasm is not just perception. The prolactin-driven hormonal shift after ejaculation has measurable calming effects, and research on masturbation as a coping tool, while mainly conducted in women, has found that people use it deliberately to manage stress and induce positive mood states like relaxation and happiness.¹² There is no strong reason to think this mechanism would be sex-specific. Men commonly report using masturbation to unwind, and the underlying neurochemistry is similar.

On the immune front, one small but frequently cited study measured blood samples before, during, and after sexual arousal and orgasm in men. Natural killer cells, a type of white blood cell involved in immune surveillance, increased in the bloodstream following orgasm. Other immune markers like T cells and B cells did not change.¹³ A transient spike in natural killer cells is interesting but should not be oversold. It does not mean masturbation “boosts your immune system” in any clinically meaningful way. The body’s immune response to arousal and orgasm is real, but whether it translates to fewer colds or better health outcomes is unknown.

Testosterone and Hormones

One of the most persistent myths online is that masturbation lowers testosterone. The actual evidence is more subtle. A small randomized crossover study in young healthy men found that masturbation appeared to counteract the normal daily decline in free testosterone, meaning levels stayed slightly higher through the day compared with a control condition where the men did neither masturbate nor watch erotic material.¹⁴ However, the ratio between total testosterone, free testosterone, and cortisol did not change in a statistically meaningful way. What this tells us is that a single act of masturbation neither tanks nor supercharges testosterone. The hormonal effects are tiny and transient. Claims that abstaining from masturbation will raise testosterone to performance-enhancing levels, popular in certain online communities, are not supported by the clinical data.

Fertility and Sperm Quality

For men trying to conceive, ejaculation frequency matters, but not in the way many assume. A cross-sectional study looking at how often men ejaculated found that higher frequency was associated with lower sperm DNA fragmentation, which is a marker of genetic damage in sperm. It was also linked to better sperm vitality. The tradeoff was lower semen volume and lower total sperm count per ejaculate, which makes sense: ejaculate more often and each sample has fewer sperm, but those sperm tend to be fresher and healthier.¹⁵ Progressive motility, the measure of how well sperm swim forward, was not affected by ejaculation frequency. Importantly, higher frequency did not increase the risk of having too few sperm (oligozoospermia) or poorly motile sperm.

The practical implication for couples trying to get pregnant is that prolonged abstinence to “save up” sperm may actually backfire by allowing DNA damage to accumulate. The common fertility advice to have sex every one to two days during the fertile window is consistent with this research. Masturbation outside that window does not appear to harm fertility prospects.

When Masturbation Habits Affect Sexual Function

Masturbation itself is not harmful, but certain masturbation habits can create real problems during partnered sex. The best-documented example is delayed ejaculation, where a man can orgasm alone but struggles to do so with a partner. Clinicians treating this condition note that many affected men have developed what they call an idiosyncratic masturbatory style, meaning they use a speed, pressure, or technique that a partner’s body simply cannot replicate.¹⁶ The brain essentially becomes conditioned to respond only to a very specific stimulus pattern.

Research on delayed ejaculation subtypes has found that lower pleasure and arousal during masturbation, reduced penile sensitivity during self-stimulation, and higher age are among the strongest predictors of having difficulty reaching orgasm during all forms of sex, not just partnered intercourse.¹⁷ This suggests that the issue is not simply “too much masturbation” but a complex interaction between technique, sensitivity, and psychological engagement.

Beyond delayed ejaculation, atypical masturbatory behaviors carry their own risks. A study of men with premature ejaculation found that those who masturbated in atypical ways, such as rubbing against surfaces while lying face down (prone masturbation) or through clothing, had significantly higher rates of accompanying erectile dysfunction.¹⁸ Prone masturbation in particular applies intense pressure that normal stimulation cannot match, and urologists have flagged it as a correctable cause of sexual dysfunction for decades. The fix is straightforward: gradually transition to conventional technique. Most men who do so see improvement.

Compulsive Masturbation and When to Seek Help

Frequency alone does not make masturbation a problem. There is no clinical threshold of “too many times per week.” What clinicians look for instead is whether the behavior causes distress, interferes with daily responsibilities, damages relationships, or feels out of the person’s control. Compulsive sexual behavior, which can include compulsive masturbation, is diagnosable under existing medical classification systems even though the specific label of “sex addiction” has faced skepticism from parts of the psychiatric community.¹⁹

Signs that masturbation has crossed from normal behavior into problem territory include missing work or social obligations to masturbate, continuing despite physical irritation or injury, using it as the sole way to manage negative emotions, or feeling unable to stop even when you want to. If any of those apply, a therapist with training in sexual health is the right starting point. Treatment typically involves cognitive-behavioral approaches rather than shaming the behavior entirely.

Guilt and Cultural Stigma

For a behavior practiced by the vast majority of men, masturbation carries a surprisingly heavy load of shame in many cultures. Nearly all major religions have historically prohibited or discouraged it, and those prohibitions create real psychological consequences. A clinical case series documented cases where intense guilt over masturbation was associated with severe mental health symptoms, underscoring that the harm does not come from the act itself but from the internal conflict between natural behavior and deeply held beliefs about its sinfulness.²⁰ Cultural myths linking masturbation to weakness, hair loss, blindness, or insanity persist in various forms worldwide, despite having no basis in evidence. Men who grow up absorbing these messages may develop chronic anxiety around a perfectly normal behavior, and that anxiety itself becomes the health problem.

The irony is thick. The evidence broadly suggests that masturbation has neutral to positive health effects, yet the guilt layered onto it by cultural messaging can generate real psychological distress. For men in this position, understanding the evidence base can itself be therapeutic.

Masturbation and Relationship Satisfaction

A common concern, sometimes voiced by partners and sometimes by men themselves, is whether masturbation within a relationship signals dissatisfaction or threatens intimacy. A large Norwegian study of over 4,000 adults explored this question and found the relationship between masturbation and sexual satisfaction is not straightforward. Using cluster analysis, the researchers identified four distinct patterns in both men and women: high masturbation with high satisfaction, low masturbation with high satisfaction, high masturbation with low satisfaction, and low masturbation with low satisfaction.²¹ In other words, there is no simple rule. Some men who masturbate frequently are perfectly happy in their sex lives; others who rarely masturbate are unsatisfied.

The study did find a gender difference worth noting. For women, masturbation tended to follow a complementary pattern, adding to an already active sex life. For men, masturbation was more likely to follow a compensatory pattern, filling in gaps when partnered sex was less available. This does not mean masturbation replaces or undermines a relationship, but it does suggest that for some men, a spike in masturbation frequency may be a signal worth paying attention to as an indirect marker of unmet sexual needs within the partnership rather than a problem in itself.

Why Masturbation Exists at All

From a pure evolutionary standpoint, masturbation is a puzzle. It spends energy and, at least in males, it uses up sperm with no chance of reproduction. Yet it is not just a human quirk. A large comparative study across primates found that masturbation is widespread in the primate family tree and appears to be an evolved trait, not a random byproduct of high sex drive.²² The researchers tested two hypotheses. First, that masturbation helps males compete reproductively by clearing older, lower-quality sperm and keeping fresher sperm ready for mating opportunities. Second, that ejaculation flushes pathogens from the genital tract, reducing the risk of sexually transmitted infections. The data supported both ideas in male primates.

This does not mean every man who masturbates is subconsciously preparing for a mating opportunity. But it does reframe the behavior as something deeply embedded in primate biology rather than a modern indulgence or a failure of willpower. The fact that it appears across so many primate species, and correlates with specific reproductive and pathogen-related pressures, suggests it has been shaped by natural selection over millions of years. Whatever your personal feelings about it, your biology has been doing this for a very long time.